Sorry, no online dictionaries contain the exact phrase without letting someone know.
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Reverse dictionary results:
1. covertly
2. secretly
3. clandestinely
4. surreptitiously
5. stealthily
6. backstair
7. backstairs
8. behind-the-scenes
9. concealingly
10. conspiringly
11. covert
12. disguisedly
13. disingenuously
14. furtive
15. hiddenly
16. hugger-mugger
17. hushedly
18. in camera
19. latently
20. low-key
21. lurkingly
22. off-the-record
23. on the sly
24. secretively
25. sneak
26. sneakily
27. sneaking
28. sneakingly
29. sub rosa
30. subreptitious
31. subversively
32. surreptitious
33. under the counter
34. undercover
35. underhand

You can look up the words in the phrase individually using these links:   without ?   letting ?   someone ?   know ?
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