THE READERS
A rebellious teenage girl and her brother discover a time-traveling chaise lounge in their Grandmother's attic- trapped in the past and facing King Tut's wrath, they find help from an unlikely source- their teenage Grandmother in 1956.
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I have modified the last section to bring the irony full circle: “their rebellious teenage Grandmother in 1956.”
The idea is good. The logline itself is on log run-on sentence, and should be double checked for grammar prior to any official substitution.